Question

目前我有2张桌子。服务1的名称和服务信息。

我需要从服务名称中获取所有唯一名称，并显示其中附加了多少服务信息。

SELECT cs.serviceDesc as 'SERVICE', COUNT(cr.serviceId) as 'Count',
FROM consultationRequests cr
JOIN consultationServices cs on cs.serviceId = cr.serviceId 
JOIN demographic d on d.demographic_no = cr.demographicNo 
WHERE cs.active = 1  
AND cr.referalDate between '2018-11-31' and '2019-01-20' 
GROUP BY cr.serviceId

咨询请求中还有另一列，其状态编号在1-4之间。我需要为每个状态添加另一列，并在服务名称内计算该状态内的信息数量。

Answer 1

您可以使用条件聚合：

SELECT cs.serviceDesc as SERVICE,
       COUNT(cr.serviceId) as Count,
       SUM(cr.consultationRequests = 1) as cnt_1,
       SUM(cr.consultationRequests = 2) as cnt_2,
       SUM(cr.consultationRequests = 3) as cnt_3,
       SUM(cr.consultationRequests = 4) as cnt_4
FROM consultationRequests cr JOIN
     consultationServices cs
     ON cs.serviceId = cr.serviceId JOIN
     demographic d
     ON d.demographic_no = cr.demographicNo 
WHERE cs.active = 1  AND
      cr.referalDate between '2018-11-31' and '2019-01-20' 
GROUP BY cr.serviceId

MySQL SELECT QUERY同一列不同的where语句

1 个答案: